Study On Ceramic Positive Temperature Coefficient Thermistor Drying Raw Silk Of Reeling

During the process of reeling of silk-producing, the conventional drying way is that silk is dried by steam tube radiation after winding on small wheel, namely drying after winding.The drying method exists some problems such as that the waste gas produced by coal burning can pollute environment, drying is extremely uneven of inner and external layer and it is easy to the silk adhere each other and so on. This paper envisage to install the drying device which is made of ceramic Positive Temperature Coefficient thermistor working as exothermic part between two adjacent fixed drums in the front of rings of interlacing silk of modified D301A automatic reeling machine to dry the raw silk before winding. The purpose is to reduce the environmental pollution, adhesion of silk and make the moisture regain of inner and external layer silk more even.Firstly, under allowable conditions of lab, after repeated study and design, processing each part of drying device then assembling them to the design of the ceramic PTC thermistor drying device, and connecting power to watch if it is emitting heat. Using YG731gauging device to simulate the process of silk reeling, the silk is dried in a different way between the bearings of the drying device, then winding onto the wheel of gauging device.Secondly, the wheel of gauging device. Secondly, The microscopic structure and physicochemical properties of the raw silk samples with drying before small wheel and conventional drying were tested by using the Y802A eight baskets of constant temperature oven, XL-2tensile tester, Y731cohesion machine, scanning electron microscopy (SEM), Fu Liye infrared (FT-IR), X ray diffraction (XRD).To compare the similarities and differences between them, and explore the feasibility and superiority of the drying methods which preferred drying. Finally, on the basis of the study above, to put forward the idea of integration of silk reeling process, let the silk process shorter and more convenient. Then analyzing the necessity, feasibility and superiority of the idea of the integration of silk reeling process by theory, wishing to provide a reference for the development direction of silk industry.The results showed that under the condition of laboratory (when the temperature is25℃, the relative humidity is45%), using the drying device of ceramic PTC thermistor dry the silk, the dry effect is obvious. Be away from aluminum whose surface temperature is150℃0.6mm, when running the length of about270mm, can make the yarn moisture drying to25%-35%, when running the length of about630mm, moisture regain is smaller than the public regain (11%); Comparing with conventional steam pipe radiation drying on small wheel, first dried by the device of ceramic PTC thermistor, the longitudinal morphology, protein structure, crystal structure and winding of the silk samples did not change, that is the preferred drying then winding will not affect the silk structure; Through analyzing the main physical performance like tensile strength, cohesion, cutting and cleaning, clean, etc of two kinds of raw silk samples,these findings suggests that the method of preferred drying then winding did not affect the properties of silk fiber. Because silk is wound after drying, so hard rubber and adhesion of fiber are alleviated to some extent. Observation, to change the heating mode of the electric energy into heat energy did not bring any pollution to the laboratory or the surrounding environment. In addition, the idea of integration of silk reeling process that is from cocoon cooking to reeling (dry silk)to big wheel to finishing (twist the raw silk) owns the unparallel advantage and may be the development direction of the silk industry.